This paper discusses the concept of public-key encryption in depth, providing the number-theoretic and complexity-theoretic basis needed for its analysis. It also provides a survey of other public-key encryption methods, and concludes with an alternative application for RSA and public-key encryption in general, public-key signatures.

Simeck is a new lightweight block cipher design based on combining the Simon and Speck block cipher. While the design allows a smaller and more efficient hardware implementation, its security margins are not well understood. The lack of design rationals of its predecessors further leaves some uncertainty on the security of Simeck. In this work we give a short analysis of the impact of the desig...

We analyze the security of elastic block ciphers against key-recovery attacks. An elastic version of a fixed-length block cipher is a variable-length block cipher that supports any block size in the range of one to two times the length of the original block. Our method for creating an elastic block cipher involves inserting the round function of the original cipher into a substitution-permutati...

Curupira is a 96-bit block cipher, with keys of 96, 144 or 192 bits, and variable number of rounds, an algorithm described at SBRC 2007. This paper1 presents impossible-differential, boomerang and higher-order multiset attacks on reduced-round versions of Curupira, that were not previously considered in the security analysis by its designers. Also, we provide security analyses based solely on t...

This paper proposes an improved method of reversible data hiding with increased capacity. The conventional method determines whether to embed a data bit in an image block according to the statistics of pixels in that block. Some images have pixel statistics that are inadequate for data hiding, and seldom or never have data embedded in them. The proposed method modulates the statistics invertibi...